关键词: 加锚, 异性结构面, 直剪, 抗剪强度, 声发射

Abstract: There are structural planes with different lithology on both sides in nature,and anchors are commonly used in engineering to inhibit the sliding of structural planes. In order to study the direct shear characteristics of anchored anisotropic structural plane,the direct shear experiment was carried out. Combined with the results of acoustic emission monitoring,the shear strength,failure type and crack evolution law of the anchored anisotropic structural plane are discussed. The results show that:With the increase of the strength of the weak sidewall rock in the anisotropic structural plane with anchor, the shear strength increases nonlinearly. The shear strength of the structural plane with anchor increases by 200%,267% and 303% respectively compared with that without anchor. The failure types are shear,tensile shear and splitting,and the main crack direction is basically the same as the shear direction;The shear-displacement curve of anchoring anisotropic structural plane is divided into four stages:compaction,elasticity,yield and failure. In the compaction stage,the anchoring agent is squeezed and destroyed. In the elastic stage,cracks appear at the extrusion position of rock mass and anchor bolt. In the yield stage,the anchor bolt undertakes the main shear resistance and deforms. In the failure stage, the rock sample is cut and broken. When the strength of the weak side rock of the structural plane is low,the acoustic emission events are concentrated in the elastic stage. When the strength of the wall rock is high,the acoustic emission events are concentrated in the yield stage;With the increase of strength of weak sidewall rock in structural plane,when λ<1 rock specimen produces large-scale shear cracks,when λ≥ 1 rock specimen produces small-scale shear cracks.

Key words: add anchor,heterosexual structural plane,direct shear,the shear strength,acoustic emission